On a Friday afternoon, the United States stopped its skies: the Federal Aviation Administration ordered every aircraft to stay on the ground after communications failed at its regional air traffic control centres. It was a rare pause, only the second of its kind since September 2001, and it rippled outward across oceans and borders until thousands of journeys had been cancelled or suspended. By evening the stop was lifted and departures were resuming, though the day left a reminder of how much of modern life depends on invisible channels of speech between machines and the people who guide them
FAA Lifts Nationwide Ground Stop After Communications Failure Strands Thousands of Flights
Thousands of travellers were stranded or delayed, and NBA, NHL and NFL teams were left stuck in transit.
Only the second nationwide ground stop in the U.S. since Sept. 11, 2001
Mark
Why does this one stand out? Ground stops happen.
Mimi
Not nationwide ones. This is only the second since September 11, 2001, and it began with a communications problem at the regional control centres.
Mark
And it reached beyond the U.S.?
Mimi
Quickly. Europe's agency halted U.S.-bound departures from 5 p.m. Eastern until midnight, Air Canada cancelled all U.S. flights for the day, and Toronto Pearson alone lost more than 100.
Luke
Do we know what actually failed?
Mimi
Only at the level officials gave: a communication issue affecting all the centres.
Luke
So the cause is still unexplained. What has been ruled out?
Mimi
Microsoft said it saw no link to Thursday's outage, and ASI said its SMART system wasn't involved. The DHS secretary said there was no indication of a threat.
Luke
Those are denials and an early assessment, not a finding. Nothing has been confirmed.
Mark
What about people on the ground?
Mimi
Passengers were told not to come to airports without confirmed bookings. Teams like the Nets sat on a halted plane, and Amtrak's phone lines and app were swamped.
Luke
And the weekend? Nobody has said how long recovery takes.
O Pulso
- At about 4 p.m. Eastern, the FAA halted every U.S. flight, and airports from Toronto to Boston suddenly went quiet.
- Europe suspended U.S.-bound departures, and Air Canada cancelled all its American service, leaving travellers stranded at airports.
- Officials insisted there was no threat to the country, while the Transportation Secretary blamed a communication issue at every air route traffic control centre.
- Sports teams, Amtrak passengers and NFL schedules were thrown into uncertainty as systems strained under the load of rebooking.
- By evening the ground stop was lifted and some Pacific and domestic flights began moving, but the backlog of cancelled flights and displaced aircraft remains to be cleared over the weekend.
On a Friday afternoon, the United States stopped its skies: the Federal Aviation Administration ordered every aircraft to stay on the ground after communications failed at its regional air traffic control centres. It was a rare pause, only the second of its kind since September 2001, and it rippled outward across oceans and borders until thousands of journeys had been cancelled or suspended. By evening the stop was lifted and departures were resuming, though the day left a reminder of how much of modern life depends on invisible channels of speech between machines and the people who guide them.
On Friday afternoon, a little after 4 p.m. Eastern, the Federal Aviation Administration told every aircraft in the United States to stay on the ground. The agency cited extraordinary circumstances tied to communications problems at its regional air traffic control centres. It was only the second nationwide ground stop since the attacks of September 11, 2001, and by evening it had been lifted, though not before the effects had travelled far beyond American airspace.
Across the world, the halt was felt at once. Europe's aviation agency paused U.S.-bound departures at the FAA's request, and in Canada Air Canada cancelled every flight to and from the United States for the day. At Toronto Pearson, more than 100 American flights were cancelled, and the spokesperson there described the situation as very fluid while urging travellers without confirmed bookings to stay home. Ottawa offered the FAA its full assistance, and the federal government updated its travel advisory to warn of disruption.
As restrictions eased, some flights began to move, particularly across the Pacific and from Boston. Yet the disruption reached into everyday lives as well. Amtrak customers struggled to book tickets through its website and app, and several professional sports teams found themselves stranded in transit, with NHL and NBA travel for Saturday games thrown into doubt and NFL scheduling left uncertain.
Officials were quick to rule out a security threat, and both Microsoft and the developer of a new AI scheduling system said their products were not to blame. What remains unanswered is the root cause of the communications failure, and how long it will take for the backlog of cancelled flights and displaced aircraft to clear over the weekend.
On Friday afternoon, around 4 p.m. Eastern, the U.S. Federal Aviation Administration told every aircraft in the country to stay on the ground. By evening the agency had lifted that nationwide ground stop and said departures could resume, but not before thousands of flights around the world had been cancelled or suspended. It was only the second nationwide ground stop in the United States since the attacks of Sept. 11, 2001.
The FAA cited "extraordinary circumstances" tied to communications problems at its regional air traffic control centres. Transportation Secretary Sean Duffy said in a social media post that a "communication issue" affected all U.S. Air Route Traffic Control Centers. Hundreds of flights were diverted. The Homeland Security secretary, Markwayne Mullin, said there was no indication of a threat to the U.S. The White House said Mullin and Duffy would brief the public Friday evening.
The effects reached well beyond American airspace. Europe's aviation agency, which manages air traffic for its 42 member countries, suspended U.S.-bound departures at the FAA's request from 5 p.m. Eastern until midnight. In Canada, NAV CANADA said it was putting traffic management measures in place at Toronto Pearson, Montréal-Trudeau, Calgary and Vancouver. Air Canada cancelled all flights to and from the U.S. through Friday, and said service to the Caribbean and South America might also be affected because those routes pass through U.S. airspace. Spokesperson Yasmine Mehdi said aircraft already in the air had been told they could continue.
At Toronto Pearson, spokesperson Erica Vella described the situation as "very fluid." She told CP24 that more than 100 U.S. flights had been cancelled, along with 20 other international flights, and urged anyone without a confirmed booking to stay home. The airport added staff, sent support teams into the terminals, and put a parking plan in place for aircraft. The Greater Toronto Airports Authority said flights that did not need U.S. airspace would keep operating. At Billy Bishop airport, Air Canada and Porter cancelled all remaining U.S. flights for the day. Regina's airport lost an incoming Minneapolis-St. Paul flight. Canada's Transport Minister, Steven MacKinnon, wrote on X that Ottawa had offered the FAA its "full assistance," including accommodating U.S.-bound aircraft, and the federal government updated its U.S. travel advisory to warn of disruptions.
As the restrictions eased, some flights began to move. San Francisco said flights across the Pacific, including to Hawaii and Asia, were cleared from about 5 p.m. Eastern, and Mullin had said international flights would be handled case by case. Boston Logan said the FAA had given flights there permission to depart, though it did not say where they were headed or how many.
The disruption spilled into other areas. Amtrak reported higher-than-normal call volumes, and passengers said they had trouble booking through its website and app; Downdetector reports of outages spiked around 7 p.m. Eastern. In sports, the Nets had boarded their plane in New Orleans for Memphis when it was halted. Five NBA teams were due to fly Friday for Saturday games. The NHL had 14 games scheduled Saturday, and the Sharks were stuck waiting to leave for Utah, while the Panthers had already reached St. Louis. With no timeline from the FAA at first, most of the NFL's Week 10 schedule was uncertain.
One question was quickly addressed: the cause. Microsoft said it had no indication the stop was related to the outage that took Outlook and other services offline Thursday. The communications problems also did not appear linked to the FAA's new AI-powered SMART system, which analyzes flight schedules, weather and other data from a single site near Washington. Its developer, ASI, said the ground stop was not a result of SMART or any of its products.
What remains to be seen is whether the FAA names the root cause of the communications failure and how long the backlog of cancelled flights and displaced aircraft takes to clear over the weekend.
Citações Notáveis
Canada has offered its full assistance to the FAA as it manages the situation.— Steven MacKinnon, Canada's Transport Minister
The situation is very fluid.— Erica Vella, Toronto Pearson spokesperson
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